1. More wild tigers have been seen in the forest around this area, _______ there used to be very few.
A. when B. where C. what D. which
【解析】选B。句意：在附近的森林中发现了更多的野生老虎，而在过去，这一地区老虎数量非常少。先行词the forest在定语从句中作状语，且表地点故用where。
2. _______ , the fine shall be paid in cash.
A. That we all know B. We all know
C. It is known to us all D. As we all know
【解析】选D。句意：众所周知，应用现金支付罚款。as引导非限制性定语从句，as代指主句的全部内容。如果用B、C两项，后面不能用逗号，还需加连词that。
